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Author Topic: CPC 464 blue sceen problem  (Read 7856 times)

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Offline Alexandre Rouma

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Re: CPC 464 blue sceen problem
« Reply #100 on: 13:17, 06 September 16 »
I also cleaned the board and remade all solder joints that looked bad.
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Offline Alexandre Rouma

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Re: CPC 464 blue sceen problem
« Reply #101 on: 13:32, 06 September 16 »
Here is what I measure un the z80:

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Offline Alexandre Rouma

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Re: CPC 464 blue sceen problem
« Reply #102 on: 13:49, 06 September 16 »
And, the gate array(IC116):
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Offline Bryce

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Re: CPC 464 blue sceen problem
« Reply #103 on: 13:56, 06 September 16 »
I'm sure that's a good exercise to try out your new scope, but it doesn't really tell you much about what's wrong with your CPC. Try measuring pin 14 of each RAM IC and see what you get.

Bryce.
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Offline Alexandre Rouma

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Re: CPC 464 blue sceen problem
« Reply #104 on: 17:14, 06 September 16 »
I get changing data, i'll upload a picture when I find my thumb drive ^_^
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Offline Alexandre Rouma

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Re: CPC 464 blue sceen problem
« Reply #105 on: 21:27, 06 September 16 »
can't find my thumb drive :/

But, I get changing data on all ram chips I also measured there temperature and they are all under 30°C
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Offline Bryce

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Re: CPC 464 blue sceen problem
« Reply #106 on: 10:45, 07 September 16 »
Then the RAM is probably fine. The CRTC and the 74LS153 chips would be the next thing to test.

Bryce.
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Offline Alexandre Rouma

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Re: CPC 464 blue sceen problem
« Reply #107 on: 14:35, 07 September 16 »
Ok, i'll test that right now :)
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Offline Alexandre Rouma

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Re: CPC 464 blue sceen problem
« Reply #108 on: 18:26, 08 September 16 »
I haven't tested the crtc yet, but the 74LS153 are working. My dad needs the televison right now, so I can test the video now that I redid all the solder joints...
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Offline ReCat

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Re: CPC 464 blue sceen problem
« Reply #109 on: 20:23, 09 January 17 »
Apologizing for bumps (if that is sinful in this forum) but I just wanted to say that I find all the random "unnecessary" details Alexandre Rouma here posts pretty useful as i have a point of reference to compare all these signals to. I too have the a similar issue he has, recently got a CPC464 and it's original monitor both packed inside their original boxes with plastic bags and styrofoam!
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Offline Bryce

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Re: CPC 464 blue sceen problem
« Reply #110 on: 22:43, 09 January 17 »
Hi and welcome ReCat,
      I would suggest that you start a new thread to discuss the issues you're having with your 464. To speed things up, you should post a picture of what the screen looks like on bootup in the first post.

Bryce.
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Offline ReCat

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Re: CPC 464 blue sceen problem
« Reply #111 on: 07:16, 11 January 17 »
Hey, Thanks. I had a local ametur radio friend over who is very familiar with these, so I think we have diagnosed what it's problem is already. I may open another thread to document my experience still, though. Good idea.
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Offline Alexandre Rouma

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Re: CPC 464 blue sceen problem
« Reply #112 on: 18:16, 04 May 17 »
So... I'm very sorry for being absent this much time :( I had SO much work from school. I'll try to continue the repair this week or during july and august.

Also, I was wondering if someone now what type of screms are used to hold the case together ?
The screws were in the back cover of the CPC but my father knocked it of a shelf  >:( ...

Anyway, have a nice day !
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